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  • Relaxor characteristic and phase evolution of complex perovskite barium titanate bismuth zinc titanate ceramics

    Creator:
    Triamnak, Narit
    Abstract:
    Relaxor characteristic of the solid solution (1-x)BaTiO₃-(x)Bi(Zn₁/₂Ti₁/₂)O₃ (BTBZT) was investigated in this research. X-ray diffraction technique and Raman spectroscopy revealed the crystal structure of BT-BZT at various compositions. For compositions with x ≤ 0.08, the solid solutions exhibited clear tetragonal symmetry and transitioned to pseudo-cubic symmetry as the content of...
    Resource Type:
    Dissertation
    Full Text:
    Schneider and Dr. Julie Tuckier for serving as committee member and advises. Thank you all Electroceramics

  • Recognizing human group activities in video through mining optimal features

    Creator:
    Amer, Mohamed R.
    Abstract:
    Given a video, we would like to recognize group activities, localize video parts where these activities occur, and detect actors involved in them. To this and, we propose a novel, mid-level feature, called control point, for representing group activities. The control points are aimed at summarizing visual cues, lifting from...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Mohamed R. Amer for the degree

  • Photophysics of organic semiconductors at the nanoscale

    Creator:
    Grollman, Rebecca R.
    Abstract:
    Organic semiconductors are used in a wide variety of applications including transistors,solar cells, and light emitting diodes. These materials are solution-processable,low cost, and tunable. Many successful organic optoelectronic materials utilizeblends of several types of molecules (such as donors and acceptors) in order topromote charge generation. As blends are an inherently...
    Resource Type:
    Dissertation
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    AN ABSTRACT OF THE DISSERTATION OF Rebecca R. Grollman

  • Label free biosensing with carbon nanotube transistors

    Creator:
    Leyden, Matthew R.
    Abstract:
    As electronics reach nanometer size scales, new avenues of integrating biology and electronics become available. For example, nanoscale field-effect transistors have been integrated with single neurons to detect neural activity. Researchers have also used nanoscale materials to build electronic ears and noses. Another exciting development is the use of nanoscale...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE THESIS OF Matthew R

  • Scanning photocurrent microscopy study of photovoltaic and thermoelectric effects in individual single-walled carbon nanotubes

    Creator:
    DeBorde, Tristan
    Abstract:
    Carbon Nanotubes are a unique family of nanostructures that have shown remarkable promise for mechanical, electrical, and optical applications. Fundamentally similar to the earlier discovered Buckminsterfullerene (C₆₀), carbon nanotubes are hollow cylinders formed from a single sheet of carbon atoms. The research presented in this dissertation investigates several carbon nanotube...
    Resource Type:
    Dissertation
    Full Text:
    . 12 1.5 References 1 Wilder, J. W. G., Venema, L. C., Rinzler, A. G., Smalley, R. E. & Dekker

  • Analysis of domain decomposition methods for the simulation of charge transport in semiconductor structures with heterojunctions

    Creator:
    Costa, Timothy B.
    Abstract:
    Charge transport in a semiconductor structure with heterojunction is described by a multiscale partial differential equation model. This model can be used, e.g., for the design of more efficient solar cells. Phenomena at the heterojunction must be resolved at the angstrom scale while the size of the device is that...
    Resource Type:
    Masters Thesis
    Full Text:
    collaborators David Foster and Guenter Schneider from the Physics Department at Oregon State University for

  • Electronic and Optical Properties of Organic Semiconductors : Experiment and Simulation

    Creator:
    Johnson, Brian
    Abstract:
    The continued development of organic semiconductor materials relies on an understanding of the relationship between optoelectronic properties, molecular structure, and molecular interaction. Several detailed studies of electronic properties in functionalized polyacene materials are presented. A computational model which allows the extraction of charge generation and transport properties from experimental data...
    Resource Type:
    Dissertation
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    this work. (B) These groups are attached at the R positions of the backbone to modify the solid state

  • Subwavelength light confinement and quantum chaos in micro- and nano-structured metamaterials

    Creator:
    Govyadinov, Alexander A.
    Abstract:
    This dissertation concerns a broad range of unique phenomena related to the light propagation at nano- and micro-scales. To access the nano-domain, we introduce anisotropy-based waveguides with positive- and negative-index modes. These novel structures allow energy propagation in subwavelength regions and, in contrast to surface waves, have the mode structure...
    Resource Type:
    Dissertation
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    radius is R = 1µm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.4 The dispersive

  • Existence of Eta-Quotients for Squarefree Levels and Modular Type Supercongruences for Hypergeometric Functions

    Creator:
    Allen, Michael
    Abstract:
    In this dissertation, we consider two problems in number theory, both relating to modular forms. First we consider when a given modular form can be expressed as a quotient in Dedekind's $\eta$ function. Rouse and Webb \cite{RW} have determined the integers $N \leq 500$ such that the graded ring of...
    Resource Type:
    Dissertation
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    Petsche, Tom Schmidt, and Guenter Schneider, for their time and insight. Personal This journey would

  • Quantum and Classical Simulation of Electronic Transport at the Nanoscale

    Creator:
    Gruss, Daniel S.
    Abstract:
    Time-dependent electronic transport is increasingly important to the state-of-the-art device design and fabrication. The development of nanoscale sensing, the harnessing and control of structural fluctuations, and the advancement of next-generation materials all require a treatment of quantum dynamics beyond the level of traditional methods and a more nuanced approach to...
    Resource Type:
    Dissertation
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    committee members Ethan Minot, David Roundy, and Guenter Schneider. Fellow collaborators Kirill Velizhanin

  • Optoelectronic properties of organic semiconductor materials : from bulk to single molecule

    Creator:
    Shepherd, Whitney E. B.
    Abstract:
    The behavior and application of organic semiconductor materials depend strongly on their molecular structure, and molecular interactions. Several studies of intermolecular interactions in functionalized polyacene materials are presented. The degree and onset of aggregation of a functionalized anthradithiophene derivative was studied as a function of concentration in two different host...
    Resource Type:
    Dissertation
    Full Text:
    . Guenter Schneider provided feedback and discussions which I have found extremely valuable. Prof. Henri

  • The optical properties of multi-scale plasmonic structures and their applications in optical characterization and imaging

    Creator:
    Kuhta, Nicholas Anthony
    Abstract:
    The optical response of metallic structures is dominated by the dynamics of their free electron plasma. Plasmonics, the area of optics specializing in the electromagnetic behavior of heterogeneous structures with metallic inclusions, is undergoing rapid development, fueled in part by recent progress in experimental fabrication techniques and novel theoretical approaches....
    Resource Type:
    Dissertation
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    2.4. Deriving the Necessary Conditions for Nonzero ∆R . . . . . . . . . . . . . . . . . . . . . 31

  • The Formation of Astrophysical Dust

    Creator:
    Mauney, Christopher M.
    Abstract:
    The formation of carbonaceous and silicate precursor molecules to astrophysical dust grains is investigated. Using density functional theory (DFT) in combination with global optimization techniques, the ground-state binding energies of dust precursors are determined. These results are employed in atomistic nucleation theory (ANT) to predict the critical size and nucleation...
    Resource Type:
    Dissertation
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    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 LIST OF FIGURES Figure Page 1.1 The H-R diagram

  • Information Processing in Multicellular Networks

    Creator:
    Potter, Garrett D.
    Abstract:
    The ability for individual cells and multicellular networks to process information contained in perceived stimuli is of vital importance to their proper functioning and ultimately their cellular fate. The primary mechanism employed by cells to this end is the use of biochemical signaling in which a series of molecular events...
    Resource Type:
    Dissertation

  • Exchange interaction studies in magnetic semiconductors by neutron scattering

    Creator:
    Wiren, Zachary Quincy
    Abstract:
    Theories predict that making a dilute magnetic semiconductor strongly p -type would allow it to remain ferromagnetic at room temperature. This is of intrest as a ferromagnetic semiconductor would allow for a great many applications in the field of spintronics. Neutron scattering experiments were undertaken to better understand the antiferromagnetic...
    Resource Type:
    Dissertation
    Full Text:
    Haller, Henri Jansen, Yun-Shik Lee, Oksana Ostroverkhova, Guenter Schneider, and Phil Siemens. TABLE

  • Nonlinear behavior of thermal and ion transport at the nanoscale

    Creator:
    Sahu, Subin
    Abstract:
    Functional control at the nanoscale forms the foundation of biological systems. These work at the cellular level by manipulating ions and molecules. Nanoscale devices that give functional control at this scale are also becoming an important component in diverse fields such as electronics, medicine, engineering, and manufacturing. Moreover, scientific advances...
    Resource Type:
    Dissertation
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    , Guenter Schneider, Weihong Qiu and P. Alex Greaney for their instructions. I also want to thank the

  • Structure-property relationships of layered oxypnictides

    Creator:
    Muir, Sean W.
    Abstract:
    Investigating the structure-property relationships of solid state materials can help improve many of the materials we use each day in life. It can also lead to the discovery of materials with interesting and unforeseen properties. In this work the structure property relationships of newly discovered layered oxypnictide phases are presented...
    Resource Type:
    Dissertation
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    . Special thanks to Arthur Sleight, Michael Lerner, Brady Gibbons, and Guenter Schneider for serving as my

  • Growth and characterization of the p-type semiconductors SnS and BiCuOSe

    Creator:
    Francis, Jason
    Abstract:
    BiCuOSe and SnS are layered, moderate band gap (ε[subscript G] ≈ 1 eV) semiconductors that exhibit intrinsic p type conductivity. Doping of BiCuOSe with Ca results in a slight expansion of the lattice and an increase of the hole concentration from 10¹⁸ cm⁻³ to greater than 10²⁰ cm⁻³. The large...
    Resource Type:
    Dissertation
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    crystal 22 23 Bibliography [1] A Zakutayev, D H McIntyre, G Schneider, R Kykyneshi, D.A. Keszler

  • Interlayer Electronic Interactions in Twisted and Stacked Bilayer Graphene

    Creator:
    Patel, Hiral
    Abstract:
    The photophysical properties of two-dimensional (2D) layered van der Waals (vdW) materials, and their heterostructures are manifestly distinct from crystalline bulk materials. Recently, the discovery of new 2D vdW materials and strongly-bound interlayer excitons in these materials has created a new branch in nanoscience. As such, there are a number...
    Resource Type:
    Dissertation
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    committee members Ethan Minot, Guenter Schneider, Chong Fang, Oksana Ostroverkhova, John Conley and

  • On the photoresponse of several novel oligoacene and anthradithiophene derivatives

    Creator:
    Day, Jonathan
    Abstract:
    The results of an investigation into carrier dynamics in several novel functionalized and solution-processable pentacene and anthradithiophene derivatives are reported. Measurements were made of real-time photoresponse of polycrystalline thin films of these materials to ultrafast laser pulses, on picosecond to microsecond time-scales, as well as measurements of dark current and...
    Resource Type:
    Dissertation
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    -TIPS and DCDHF. For ADT-TIPS-F, R = Si (i -PR)3. For ADT-TES-F, R = Si (Et)3